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Section-3 Operation

October 17, 2013

3‐74

WARNING:Disconnectprimarypower priortoservicing. 888‐2693‐004

3.8.1 PFRUStatusscreens

Figure 3-69 LPU PFRU Status Screens 1 & 2

Table3‐67XmtrHome>ExciterHome>Status>PFRUStatus

Field Explanation

FPGA (FieldPr

ogrammableGateArray)

Programmed Green=PFRUispr

ogrammed,Red=fault

CommunicationHe

alth Green=SerialcommunicationOKwithPFRUFPGA,Red=fault

SysRe

ferenceClocks

External1PPS

Whense

lectedasthe10MHzOCXOReference,Present=Greenbackground,Missing=Yellow.

ABluebackgroundindicatesthissourceisnotselectedasthe10MHzOCXOReference.This

inputisderivedfromthecustomer’sGPSreceiver.

External10MHz

Whense

lectedasthe10MHzOCXOReference,Present=Greenbackground,Missing=Yellow.

ABluebackgroundindicatesthissourceisnotselectedasthe10MHzOCXOReference.This

inputcanbederivedfromavarietyofsources.

InternalGP

S1PPS

Whense

lectedasthe10MHzOCXOReference,Present=Greenbackground,Missing=Yellow.A

Bluebackgroundindicatesthissourceisnotselectedasthe10MHzOCXOReference.Thissignal

isderivedfromthetransmitter’ sinternalGPSreceiver.

PLLRe

ferenceClocks

54MHz

Green=OK,Red=fa

ult.ThisisaninternalclockusedtosynchronizetheRFPLLinthePrecise

FrequencyReferenceUnit(PFRU).Non‐DABmodulationformatswilluseeithera10MHzor

54MHzreferencefortheIFPLL

10MHz

Green=OK,Red=fa

ult.ThisisaninternalclockusedtosynchronizetheRFPLLinthePrecise

FrequencyReferenceUnit(PFRU).Non‐DABmodulationformatswilluseeithera10MHzor

54MHzreferencefortheIFPLL

PLLSt

atus (LO)isLocalOscillator .

RF(L

O)PLLLock

Green=OK,Red=fa

ult.Thisreferenceoutputfromthiscircuitisusedbytheupconverterto

settheexciteroutputtothecorrectfrequencyandisusedbythedownconverterto

heterodynetheRFoutputsamplesbacktotheIFfrequency.

IF(LO)PLLLock

Green=OK,Red=fa

ult.ThisPLLoutputisusedasaref erencebytheFPGAModulator,Digital

Precorrector,andDigitaltoAnalogConverter(DAC)togeneratethetoproducethe140MHz

analogIFoutputfromthesignalprocessorboard.

IFPLLRe

f Thisindicatesthereferencefrequencyuse dbytheIFlocaloscillator.

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